Books can be expensive, even hundreds of dollars per course.
课本可能会很贵，每门课程甚至会花费几百美元。
This would be the 300 miles per hour, which, of course, is not very doable.
这是300，英尺/小时，并不是很可行的。
This course has three lectures per week.
这个课程每星期会有三堂课。
How many hours you spent in learning this course per day except leaning in class?
除了上课，你每天花多少时间学习这门课？
The Encyclopaedia is not, of course, one hundred per cent complete.
本百科全书当然不是百分之百的完善。
Desk clerk: Of course. It's $5 per hour.
接待员：当然可以，一小时5美元。 。
Prolonged Periodontal Treatment limit of one course per year of insurance.
牙周治疗疗程，每个保险年度仅限一次。
Prolonged Periodontal Treatment limit of one course per year of insurance.
牙周治疗疗程，每个保险年度仅限一次。
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